Paleogeographic basemaps

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600 Ma
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    • TheRedSaurian

    TheRedSaurian

    I decided to make a thread for these, as I plan on making more in the near future, and because I wasn't sure if the physical/labels map would be allowed in Map Thread XX.
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    600 Ma phys.png
     
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    • RMcD94

    RMcD94

    What projection is this and how did you choose that as a projection?

    It seems very strange to me to have your meridian where it is on this first map, cutting through all the landmasses, why not switch the meridian to a more appropriate spot?
     

    qazse

    Gone Fishin'
    RMcD94 said:
    What projection is this and how did you choose that as a projection?

    It seems very strange to me to have your meridian where it is on this first map, cutting through all the landmasses, why not switch the meridian to a more appropriate spot?
    Click to expand...
    1. It’s the Mollweide projection. He’s basing these maps off of the paleogeographic maps of Deep Time Maps, which use the Mollweide projection for their preview images.

    2. That’s the location of the present prime meridian.
     
    RMcD94

    RMcD94

    qazse said:
    1. It’s the Mollweide projection. He’s basing these maps off of the paleogeographic maps of Deep Time Maps, which use the Mollweide projection for their preview images.

    2. That’s the location of the present prime meridian.
    Click to expand...
    That website says that have them available in rectangular which would presumably be superior as you can change the meridian.

    How could you know where the prime meridian is? Shouldn't it move as Greenwich moves? Is Greenwich under water in this first image and it is actually tracking London?

    If it doesn't, how do they know that it doesn't move? As far as I'm aware there's nothing you could detect about meridians. (That is there is no geological evidence of meridian).

    On this time scale everything moves right, magnetic field, core, mantle, everything, so how could they work out where the prime meridian is or should be?
     
    TheRedSaurian

    TheRedSaurian

    As far as I can tell, the only way to get anything other then the low-res Mollweide maps is to buy them, which isn't an option for me.

    And I don't know how they decide meridians for prehistory, but I'm guessing it's how the continents moved relative to the core or magnetic field or something like that, as even if they move, the continents would move relative to them.

    London, as far as I can tell, is above the "o" in "Avalonia", so it couldn't be that.
     

    Algol

    RMcD94 said:
    That website says that have them available in rectangular which would presumably be superior as you can change the meridian.

    How could you know where the prime meridian is? Shouldn't it move as Greenwich moves? Is Greenwich under water in this first image and it is actually tracking London?

    If it doesn't, how do they know that it doesn't move? As far as I'm aware there's nothing you could detect about meridians. (That is there is no geological evidence of meridian).

    On this time scale everything moves right, magnetic field, core, mantle, everything, so how could they work out where the prime meridian is or should be?
    Click to expand...
    I did download the rectangular maps before they were presumably taken down, however they are quite low resolution. They're also archived: https://web.archive.org/web/20120213234040/http://cpgeosystems.com/rect_globe.html . Closeups of regions can be found here: https://deeptimemaps.com/map-room/ .

    It's not tracking Greenwich, that would be asinine. All maps should just be centered on the prime meridian today, and yes it gets more meaningless as you go further back. The movement of continents on the longitudinal axis is actually an area of active research. Latitudinal movement is mostly figured out with paleomagnetism but there really isn't anything that can give the longitudinal position of a continent. However, this paper (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4066531/) proposes that there's two deep-mantle structures that have stayed in roughly the same position that generates many mantle plume eruptions at its margins, which can be used to roughly figure out the longitudinal position of a continent with a mantle plume eruption.
     

    qazse

    Gone Fishin'
    Algol said:
    I did download the rectangular maps before they were presumably taken down, however they are quite low resolution. They're also archived: https://web.archive.org/web/20120213234040/http://cpgeosystems.com/rect_globe.html . Closeups of regions can be found here: https://deeptimemaps.com/map-room/ .
    Click to expand...
    I would just like to inform everyone that these maps are quite old and have been replaced by the maps of the Deep Time Maps website.

    Whilst I'm here, any updates on the next video, Algol? It's been a year or so since the Solar System video...
     

    Algol

    qazse said:
    I would just like to inform everyone that these maps are quite old and have been replaced by the maps of the Deep Time Maps website.

    Whilst I'm here, any updates on the next video, Algol? It's been a year or so since the Solar System video...
    Click to expand...

    Oh and I almost forgot, Prof. Scotese has newer maps in Rectangular, Mollweide, and Robinson from the PALEOMAP atlas at https://www.annualreviews.org/doi/suppl/10.1146/annurev-earth-081320-064052 . They should be higher resolution but they're not the same reconstruction as Deep Time Maps.

    Yeah uh so I did get a job at NASA recently and you can imagine how much freetime I have now. I also have like 5 different projects going at once as well, each more ambitious than the other.
     

    qazse

    Gone Fishin'
    Algol said:
    Yeah uh so I did get a job at NASA recently and you can imagine how much freetime I have now. I also have like 5 different projects going at once as well, each more ambitious than the other.
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    What are these five projects?
     
    TheRedSaurian

    TheRedSaurian

    Unfortunately the progress I had was just lost because my computer decided it was going to die and I had to restart it, getting rid of all unsaved progress on paint.net. Not that much was lost, though, and if I try I could probably finish it tomorrow.
     

    qazse

    Gone Fishin'
    TheRedSaurian said:
    Unfortunately the progress I had was just lost because my computer decided it was going to die and I had to restart it, getting rid of all unsaved progress on paint.net. Not that much was lost, though, and if I try I could probably finish it tomorrow.
    Click to expand...
    Please do so.
     
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